Mechanical Engineering Drawing

Code:

L.EM008

Acronym:

DCM

Keywords
Classification	Keyword
OFICIAL	Drawing, Design and Manufacture

Instance: 2023/2024 - 2S

Active?	Yes
Responsible unit:	Industrial Drawing Section
Course/CS Responsible:	Bachelor in Mechanical Engineering

Cycles of Study/Courses

Acronym	No. of Students	Study Plan	Curricular Years	Credits UCN	Credits ECTS	Contact hours	Total Time
L.EM	291	Syllabus	1	-	4,5	52	121,5

Teaching language

Portuguese

Objectives

Development of standardization concepts in Mechanical Engineering Drawing. Improvement of spatial visualization and technical communication skills. Introduction to design drawing. Introduction to the functional analysis of mechanical systems with the detail drawing of some components. Development of the ability to establish relationships between the design, product definition, manufacturing and verification phases.

Learning outcomes and competences

At the end of the course, the students should be able to:

1) Make orthographic assembly drawings and parts lists of mechanical systems, with the selection of standardized mechanical components.

2) Read orthographic assembly drawings and make the corresponding exploded views.

3) Make detail drawings of mechanical systems components, through a functional analysis based on the corresponding assembly drawings.

4) Identify standardized mechanical components present in actual mechanical systems for general use; know their representation in assembly drawings and accomplished elementary mechanical functions.

5) Make simple linear and angular measurements.

Technical skills acquired in this Unit are important for course units like Computer Aided Design and Manufacturing, Manufacturing Processes and Experimental & Computational Project.

Working method

Presencial

Pre-requirements (prior knowledge) and co-requirements (common knowledge)

Pre-requirements

Principles and rules for the execution of technical drawings (Technical Drawing Unit).

Principles and rules for presentation of dimensions and associated tolerances (Technical Drawing Unit).

Ability to read drawings of objects in orthographic representation and to make the correspondent pictorial representations (Technical Drawing Unit).

Co-requirements

Basic knowledge about Manufacturing Processes and Product Development techniques (Introduction to Mechanical Engineering Unit).

Program

STANDARDIZATION in mechanical engineering drawing. MECHANICAL SYSTEMS AND COMPONENTS FOR GENERAL USE. Screw threads, bolts, screws and nuts, washers, pins, circlips, rivets, welding, shaft ends, keys and keyways, splines, rolling bearings, seals for dynamic application, springs and gears. Dismounting, analysis and remounting of some actual mechanical systems. GEOMETRICAL PRODUCT SPECIFICATION. Dimensional tolerancing (complements); geometrical tolerancing; interdependence requirements between size and geometry (envelope, maximum and least material and reciprocity); general tolerances; indication of surface texture. DESIGN DRAWINGS: orthographic assembly drawings and parts lists, with the selection of standardized components. DETAIL DRAWINGS: geometric dimensioning and tolerancing (tolerance chain analysis, etc.). PRODUCTION DRAWINGS: manufacturing drawings (the need for tolerance transfer) and general assembly drawings. DIMENSIONAL METROLOGY: Introduction; simple measurement operations.

Mandatory literature

Almacinha, J.; Simões Morais, J.; "Texto de Apoio à Unidade curricular de Desenho de Construção Mecânica (L.EM)", 3ª ed., Porto: Ed. AEFEUP, 2023
José Manuel de Simões Morais; Desenho técnico básico. ISBN: 972-96525-2-X

Complementary Bibliography

ISO Standards Handbook; Technical product specification, ISO, 2009. ISBN: 978-92-67-10510-9
International Organization for Standardization; Fasteners and screws threads. ISBN: 92-67-10344-X (v. 1)
International Organization for Standardization; Technical drawings. ISBN: 92-67-10262-1 (v. 1)
International Organization for Standardization; Limits, fits and surface properties. ISBN: 92-67-10288-5
André Chevalier; Guide du dessinateur industriel. ISBN: 2-01-167583-9
Arlindo Silva; Desenho técnico moderno. ISBN: 972-757-337-1
Thomas E. French; Engineering drawing and graphic technology. ISBN: 0-07-113302-X
James H. Earle; Engineering design graphics. ISBN: 0-13-030365-8
José Manuel de Simões Morais; Desenho básico. ISBN: 972-9247-00-5

Teaching methods and learning activities

Weekly lectures (1 h TP) are based on detailed expositions of each basic topic of the course, illustrated by the presentation of application examples.

Weekly laboratory classes (1.5 h PL + 1.5 h PL) are based on brief presentations of complementary topics of the course, intercalated with the resolution, by the students, of exercises considered relevant, that can be found in the main bibliography of the course unit.

In the extracurricular laboratory classes (12 h, total), each group of students dismounts and remounts some mechanical systems for general use, in order to acquire a general perception about their working methods and compositions, examining, in addition, some constructive solutions found and getting in contact with different machine elements used in mechanical engineering. Each group makes also some simple linear and angular measurements.

The attendance to the students, by the teachers, exists throughout the semester, in pre-established hours. At the times of evaluation tests, the teachers provide, in previous days, longer periods of service.

Evaluation Type

Distributed evaluation without final exam

Assessment Components

Designation	Weight (%)
Participação presencial	20,00
Teste	80,00
Total:	100,00

Amount of time allocated to each course unit

Designation	Time (hours)
Estudo autónomo	69,50
Frequência das aulas	52,00
Total:	121,50

Eligibility for exams

Students have to attend to 75 % of the classes, according to Article 6 of the Specific Rules for FEUP's Students Assessment.

Calculation formula of final grade

Final grade = A × 0,4 + B × 0,4 + C × 0,2.

where:

A - is the "assembly drawing + mechanical components" test mark;

B - is the "detail drawing + tolerancings" test mark;

C - is the average mark of four work assignments.

Carrying out the two individual evaluation tests is a necessary condition for considering that exists a minimum number of elements that allows a correct assessment of each student.

The approval in the course unit depends on the average of the two tests marks be greater or equal than 8,0/20.

The average mark of the work assignments will be the result of the weighted mean of the marks of the following four works:

- Orthographic representation and nominal dimensioning (0,5 weight).
- Assembly drawing (1,5 weight).
- Exploded view (0,5 weight).
- Detail drawing (1,5 weight).

It will take place an optional resit exam (it will cover one test out of two).

When the final grade is greater or equal than 9,0/20, information about the work developed in the extracurricular laboratory classes may increase this grade up to a maximum of 1,0/20.

The attainment of a final grade, in the course unit, greater than 18/20 must be confirmed by a complementary test.

Special assessment (TE, DA, ...)

According to items 8.3 b) and c), 8.4 b) and c), 8.5 and 8.6 in Article 8 of the Specific Rules for FEUP's Students Assessment. Students will have to take a complementary practical exam (the teacher will specify it, before the day of the exam), where they have to show their knowledge, that couldn’t be assessed during the semester.

Classification improvement

According to Articles 11 and 12 ,of the Specific Rules for FEUP's Students Assessment.